Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 243-20080-01 found under Screw Assembled Washer by Ilc Dover Lp. The National Stock Number assigned to this part is 5305013305092, and the Federal Supply Class is 5305 Screws. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 243-20080-01.